The nickel alloy is known as Alloy 20. The base components of the austenitic alloy Alloy 20 are iron, nickel, and chromium. Particularly in corrosive situations with media like sulfuric acid, they have exceptional corrosion-resistant characteristics. The Alloy 20 Fasteners contain niobium as an anti-intergranular corrosion additive.
Traditional techniques can be used to create the Alloy 20 Fasteners, including hot working and cold working. A low-temperature alloy has excellent properties, while a high-temperature alloy has excellent properties. Standards of industrial quality and safety are adhered to when producing it.
Applications of Alloy 20 Fasteners
Alloy 20 fasteners are used to connect heat pumps, mixing tanks, metal household cleaners, food preservation tanks and racks, and pipework in mid-range corrosive chemical processing environments. Alloy 20 fasteners assist in resolving corrosion problems in the production of food and dye. Manufacturers of plastic products and synthetic fibers also make use of alloy 20 fasteners.
Prevention of Corrosion
A combination of sulfuric acid resistance and good performance in boiling sulfuric acid occurs with alloy 20 fasteners at concentrations between 20% and 40%. This environment exhibits good resistance to stress-corrosion cracks. Although Alloy 20 offers solid acid protection and performs better than Duplex or even Monel in high temperature and high concentration acids, Inconel or Hastelloy fasteners may be required. Furthermore, the resistance of Alloy 20 fasteners to nitric and phosphoric acid is useful.
Key Corrosion Resistant Characteristics
- At 20% to 40%, there is good sulfuric acid protection.
- Reasonable chloride resistance against stress corrosion cracking, pitting, and corrosion in crevices
- Good overall corrosion prevention
- Good resistance to intergranular corrosion when the material is still welded
The temperature of Alloy 20 Fasteners
With a mechanical strength of up to 1000°F and corrosion resistance of up to 99%, alloy 20 fasteners are well suited for work at high temperatures.
Welding of Alloy 20 Fasteners
The amount of carbide precipitation during welding is reduced by stabilizing welding alloy 20 with columbium. As a result, intergranular corrosion is prevented as it is welded.